c program in linux for finding the cpu utilization

[pkpprabhu]

does any one know

[sdousley]

you could use "top" from the command line. that shows CPU utilisation, as well as memory usage and updates (relatively) real time.

[sdousley]

you could use "top" from the command line. that shows CPU utilisation, as well as memory usage and updates (relatively) real time.

To Mods: Sorry, accidentally hit post twice, someone delete the dupe here. Ta.

[pkpprabhu]

no command ......
any one know function for that top command how its calling.....

[dilbert]

Here again I dare to advertise my C code snippets from here:

http://www.linuxforums.org/forum/lin...0-link-ip.html

Instead of the "ifconfig" command you can use every shell command with the popen C function.

Use then "awk" or something similar to break up the string from the shell into the appropriate pieces.

Those code snippets are from test programs I've written only for use within our lab. So, there might be more secure or versatile solutions. With more effort on the C code side you could also omit "awk".

There might be also further info from the proc file system regarding the cpu usage. If so, you could use this probabably easier than "top".

[pkpprabhu]

i need the cpu utilization percentage progam in c ...... i dont need the command "top" for that ...
to see all information

[xiona]

one of the easiest method is to put system command present in stdlib.h

[cyberjaya]

u can get the source code of top to study it.

i can roughly tell u how to do the cpu utilization code.

the easiest way is ... same as what top does.

read infomation in /proc
and grab some numberical date from respective files and manipulate them.
then u r on ur way to get what u want.


for proc file system u might want to refer

The /proc filesystem

or u just check the wikipedia website to get some info on proc file system.

it is nice to know some info on proc.

good luck.

[Lakshmipathi]

i agree..better open /proc file via c program and read the required info. from there.

[theNbomr]

The virtual file /proc/stat has the information, although you will have to do a small amount of arithmetic to create a '% CPU" figure.

man proc

for details
--- rod.